5 results about "Bright star" patented technology

The invention discloses a star point motion parameter estimation method for a high-dynamic star sensor. The method specifically comprises the following steps: (1) acquiring a star map under a dynamic condition through a fixed star sensor; (2) carrying out filtering preprocessing on the fixed star sensor image obtained in the step (1); (3) carrying out threshold segmentation on the image processed in the step (2) and carrying out connected domain extraction to obtain rough star points; (4) selecting the brightest star point in the star points obtained in the step (3); (5) obtaining a sub-pixel star point track by using the brightest star point adjacent area obtained in the step (4) and adopting a Zernike moment sub-pixel edge extraction method; and (6) utilizing the sub-pixel star point trajectory obtained in the step (5), and adopting least square fitting to obtain star point motion parameters. The method has the beneficial effects that the precision of star point trailing length and angle estimation is improved, so that the extraction precision of star points in a dynamic environment is improved, and the precision of a fixed star sensor is improved.

A method for measuring a shape of a reflector surface of a heliostat at night using a bright star at different elevation and azimuthal settings according to an embodiment of the current invention includes setting the heliostat in fixed orientation such that aberrated and overlapping star images formed are translated due to Earth's rotation in a translation direction across the heliostat array receiver; viewing images of the bright star using a fixed array of cameras placed at or near an array receiver of the heliostat, wherein each camera of the fixed array of cameras has a large aperture lens, and simultaneous exposures are made quickly enough and repeated for long enough, so that, as they translate past the cameras, the aberrated star image is fully sampled in two dimensions, and wherein every point on the reflector surface of the heliostat appears in one or more of the recorded images as being bright from reflected starlight; and processing the recorded images from the fixed array of cameras with a data processor to obtain the surface shape by integration of the surface slopes.

The present invention relates to a method for detecting faint space targets under a deep space background, which includes the steps of uniform bright star extraction, bright star feature expression and matching, global inter-frame registration, precise matching of dark stars in local areas, deformation field calculation, inter-frame alignment background suppression, and faint target extraction. A uniform bright star extraction strategy is adopted to reduce the influence of dark stars on bright star matching. Feature expression and angular distance constraints can ensure correct matching of bright stars during large inter-frame maneuvers, and global inter-frame registration is effective. A coarse-to-fine inter-frame registration strategy is adopted to update the accuracy of dark star coordinates during local alignment, improve the accuracy of deformation field, reduce background suppression noise interference, and be more robust to large field of view and large edge distortion. The method can identify discordant targets with local inter-frame motion in the field of view at the first time, provide potential faint target positions in each frame for inter-frame trajectory association, and improve the detection rate of faint targets.

The invention, which relates to the technical field of astronomical image photometric measurement, discloses an under-sampling astronomical image high-precision photometric method under a pixel phase error constraint, comprising: acquiring all astronomical images of a target fixed star, and constructing an astronomical image data set; designing a phase error constraint: reserving an astronomical image of which the pixel phase absolute value of an X axis or a Y axis is greater than 0.2 pixel; carrying out star image centering on all star images in the star image data set to obtain pixel phase information of the center of each star image, and screening the star image data set based on the phase error constraint; performing aperture metering on the reserved astronomical images to obtain the luminosity value of each astronomical image; according to the method, the astronomical image with the astronomical image center close to the pixel edge is selected to carry out photometry average value statistics, the influence of pixel phase errors can be effectively eliminated, the astronomical image photometry precision can be remarkably improved, the photometry precision is improved to 0.008 star magnitude precision from 0.06 star magnitude precision of a traditional method for an under-sampling bright star with the full width at half maximum of 0.5 pixel, and the photometry precision is obviously improved.

1. The name of this design product: Chandelier Accessories (10510 Brilliant Stars). 2. Application of this design product: for indoor lighting. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the key points of the design: Design 1 three-dimensional diagram. 5. Designate Design 1 as the base design.